Relays & Starters Flashcards
Relay
An electrical switch used to open or close circuits that consists of an electromagnetic coil.
Shading Coil (AC Relay)
Allows the magnetic coil of a relay to operate on alternating current (AC).
Motor Starter (Controller)
A general class of electrical equipment that starts and stops motors and controls torque, or speed that that starts, stops, and protects a motor from thermal overload.
A relay consists of…
a movable armature, and one or more pairs of contacts.
Relays are designed with coils which operate on…
DC or AC
The current relay coil is connected in ___with a load.
series
- The voltage or potential relay coil is connected across the ___.
voltage source
The contactor is a larger version of a ___.
relay
The motor starter is simply a ___ with overload protection.
contactor
The purpose of the ___ is to disconnect the motor from the circuit when an overload condition occurs.
overload relay
When grounding lines or equipment, make the connection to the ground first, another connection to the circuit or equipment last. True or false?
True
